Which of the Following Would Support a Retailer's Claim That

Which of the following would support a retailer's claim that the price of a particular product is the "regular price"?

A) that the product's "regular price" was printed on price tags affixed to the goods
B) that the product's "regular price" has been advertised
C) that more than 50 percent of the stock was sold at that price
D) that 30 percent of the stock was sold at that price